研究者情報 | 神奈川大学

オクノ　ショウジ Okuno Shoji 奥野　祥二所属神奈川大学情報学部システム数理学科職種助教
言語種別	日本語
発行・発表の年月	2003/12
形態種別	学術雑誌
査読	査読あり
標題	Measurement of Time-Dependent CP-Violating Asymmetries in B⁰ → φ K⁰_S, K⁺K^-K⁰_S, and η'K⁰_S Decays
執筆形態	共著
掲載誌名	Phys. Rev. Lett. 91, 261602 (2003) (6 pages)
著者・共著者	K. Abe, S. Okuno et al. [The Belle Collaboration]
概要	We present an improved measurement of CP-violation parameters in B⁰ → φ K⁰_S, K⁺K^-K⁰_S, and η'K⁰_S decays based on a 140 fb^-1 data sample collected at the υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e⁺e^- collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the three modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We find that the observed CP asymmetry in the B → φ K⁰_S decay differs from the standard model (SM) expectation by 3.5 standard deviations, while the other cases are consistent with the SM. ,BELLE-66.